Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e3f822f26ae203…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 02:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd62f63395d5745a02098f649270d626 SHA-1: f8373b42e0648c109ec841cae12adabf432889e9 SHA-256: c3e3f822f26ae203fd8583ce04d9aea3986bbb643b361c0b36e62bec786db376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. Heuristics indicate this is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=widget+pro+apk PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613229515e84a---zeforab.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/63424681659.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/xijupawozepefizaw.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/voxisutovopedimigalewisef.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/koriloj.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/66177456187.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/35052941477.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43378949208.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sg8p8tl9mus1ec9ngvp3rjkljq/sadijajirogoxilo.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/vejemo.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/72444890296.pdfIn PDF document text
    • https://novsport.com/content/File/61863071015.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wizusarawubixenizipu.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/29450682915.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81502390617.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/70243996597.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/83817696150.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/savozijul.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62811058857.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/224049338.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6b971d1fe208f3d0789ade62f19a928b/begepugigi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xifos.pdfIn PDF document text
    • http://stroi-sistema.ru/img/85867027401.pdfIn PDF document text
    • http://sakra.sk/storage/file/30352409818.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/80021572198.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 20296 bytes
SHA-256: 9666eb1bb9fbaeb0f31d3e9cbf4a2a287197919e31305ccc32efc9a33db2e99a
font_02_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10332 bytes
SHA-256: 6de3035c602534e980ee69390166441dba6c63d0e810b7cdd5b9961456a2c773
font_03_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

Open this report in the interactive analyzer, or submit your own file for analysis.